actual walking or will an elliptical do?
Dang...gotta go look up what an "elliptical" is (I thought that was the incision a preggers womyn gets in the muffin when the baby's too big....).
Seriesly, tho....the doc has her walking for the extended period to keep the blood pumping through the arteries to keep 'em clear and clean.
Bicycling doesn't cut it, because that activity focuses on the upper leg muscles....If you have "PAD", you have to focus on below-the-knee calf blood pumping.